Method and device for locking laser wavelength for gas detection

A laser wavelength and gas detection technology, applied in the measurement of color/spectral characteristics, analysis of materials, instruments, etc., can solve the problem that the spectroscopic scheme cannot be applied to spatial scanning, affects the measurement accuracy of the system, and the optical path is unstable, so as to solve the problem of measurement accuracy. , Improve the light intensity, solve the effect of waste of resources

Pending Publication Date: 2017-12-12
安徽宝龙环保科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the problem that the optical splitting scheme in the pr

Method used

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  • Method and device for locking laser wavelength for gas detection
  • Method and device for locking laser wavelength for gas detection
  • Method and device for locking laser wavelength for gas detection

Examples

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Example Embodiment

[0034] Example one

[0035] Reference image 3 As shown, the method for laser wavelength locking for gas detection disclosed in the embodiment of the present invention includes the following steps:

[0036] Step 101: Send out a laser scanning signal step by step and push the gas reference cell into the detection light path;

[0037] Step 102: Select at least one point within the range of spatial scanning, change a little current every scanning space, continuously collect at least one scanning period, and generate an absorption spectrum from the obtained optical signal;

[0038] Step 103: Adjust the laser wavelength according to the position of gas absorption in the absorption spectrum.

[0039] Compared with the original spectroscopy scheme, the present invention reduces a set of laser spectroscopy device and a set of reference light detection circuit, the light intensity of laser output can be used for detection, which is beneficial to long-distance detection, and the reduction of refe...

Example Embodiment

[0051] Example two

[0052] Corresponding to the above method, refer to Figure 5 As shown, the embodiment of the present invention also provides a laser wavelength locking device for gas detection. The device is used to perform the above wavelength locking method. The device includes: a laser 1, a detector 2, a gas absorption cell 3, an electric The push rod 4 and the control module 5, wherein the control module 5 is connected to the laser 1, the electric push rod 4 and the detector 2 respectively. The laser 1 and the detector 2 are arranged in parallel, and the light intensity emitted by the laser 1 Received by the detector 2, the detector 2 feeds back the light intensity to the control module 5. When the control module 5 needs to perform wavelength adjustment or wavelength position detection, it will give an instruction to the electric push rod 4 and control it The electric push rod 4 acts to push the gas absorption cell 3 into the detection light path between the laser and t...

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Abstract

The invention discloses a method for locking laser wavelength for gas detection. The method comprises the steps of sending out laser scanning signals in a step-by-step way at regular time, pushing in a gas reference cell in a detection light path; selecting at least one point location in a space scanning range, changing a little current every time when a space is scanned, continuously collecting for at least one scanning cycle, and producing an absorption spectrum according to the obtained optical signals; adjusting the laser wavelength according to gas absorption positions in the absorption spectrum. The invention also provides a device for locking the laser wavelength for gas detection. Compared with an original method and an original device, according to the method and the device provided by the invention, a set of laser beam splitter and a set of reference light detection circuit are reduced, the laser output light intensity can be completely used for detecting, long-range detection is carried out favorably, and the cost can be also reduced because of the reduction of the reference light detection circuit.

Description

technical field [0001] The invention belongs to the field of gas detection and discloses a laser wavelength locking method and device for gas detection. Background technique [0002] Since Tunable Semiconductor Laser Spectroscopy (TDLAS) technology has the advantages of high sensitivity, good linearity, fast detection speed, long distance and no interference from other gases, there are more and more instruments and equipment using TDLAS technology. Such as figure 1 as shown, figure 1 It is a schematic diagram of the principle of detecting the optical path using the TDLAS principle. The principle of the TDLAS detection technology is to use the absorption of gas molecules on a specific wavelength spectrum, tune the laser wavelength to the absorption line of the gas to be measured, and use a photodetector to monitor the light intensity of the laser output. , when there is a gas to be measured in the optical path, the light intensity will change with the gas concentration, and...

Claims

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Application Information

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IPC IPC(8): G01N21/39
CPCG01N21/39G01N2201/127Y02A50/20
Inventor 王小虎刘进洪顺坤王先文胡峰陈令乾姚新宇吴丽明
Owner 安徽宝龙环保科技有限公司
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